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Hello friends, what about the science of your network. It is now understood some things about my network. If you want more in my blog posts always follow. Hopefully can help you create learning networks. In this post I discuss about the determination of the path on the network layer. Congratulations learned friends.

The router uses two basic functions:

- The function of determining the path
- The function of switching

Determination pathway occurs in the network layer. Functions path determination to make the router to evaluate the path to goal and establish a way to handle the packet. Routers use routing table to determine the best path and then to pass the packet switching functions.

The concept of Link State
Another basic routing algorithm is a link state algorithm. Link state algorithm is also referred to as the Dijkstra algorithm bias or shortest path first algorithm (SPF).

Configuring Routing
To turn on a router's routing protocol, requires a global parameter settings and routing. Global tasks include the selection of routing protocols like RIP, IGRP, EIGRP or OSPF. While the routing configuration tasks for the amount of IP networks. Dynamic routing using broadcast and multicast to communicate with other routers.

IP routing configuration

Routing Protocol
On the internet layer TCP / IP, the router can use routing protocols to establish routing through an algorithm that includes:
- RIP - using an interior routing protocols with distance vector algorithms
- IGRP - using an interior routing protocol with Cisco distance vector algorithm
- OSPF - using an interior routing protocols with link-state algorithm
- EIGRP - using an interior routing protocol with Cisco's advanced distance vector algorithm
- BGP - using an exterior routing protocols with distance vector algorithms
Basic RIP described in RFC 1058, with the following characteristics:
- Distance vector routing protocols
- Metric based on the number of jumps (hop count) for route selection
- If the hop count is more than 15, packet discarded
- Update routing is done in a broadcast every 30 seconds
IGRP is a routing protocol developed by Cisco, with the following characteristics:
- Distance vector routing protocol
- Using a composite metric consisting of bandwidth, load, delay and reliability
- Update routing is done in a broadcast every 90 seconds
OSPF uses link-state routing protocols, with the following characteristics:
- Link-state routing protocol
- It is open standard routing protocol described in RFC 2328
- Using the SPF algorithm to calculate the lowest cost
- Update routing is done floaded during network topology changes
EIGRP uses an enhanced distance vector routing protocol, with the following characteristics:
- Using an enhanced distance vector routing protocols
- Using the cost load balancing is not the same
- Using a combination of distance vector algorithm and link-state
- Using the Diffusing Update Algorithm (DUAL) to calculate the shortest path
- Update routing is done in multicast using address 224.0.0.10 caused by changes in network topology
Border Gateway Protocol (BGP) is an exterior routing protocol, with the following characteristics:
- Use distance vector routing protocol
- Used between the ISP and ISP clients
- Used to route internet traffic between autonomous systems

IP routing protocols